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The double colon ( :: ) may refer to: an analogy symbolism operator, in logic and mathematics; a notation for equality of ratios; a scope resolution operator, ...
The scope resolution operator helps to identify and specify the context to which an identifier refers, particularly by specifying a namespace or class. The specific uses vary across different programming languages with the notions of scoping. In many languages, the scope resolution operator is written ::.
In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.
Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases.
The colon:, is a punctuation mark consisting of two equally sized dots aligned vertically. A colon often precedes an explanation, a list, [1] or a quoted sentence. [2] It is also used between hours and minutes in time, [1] between certain elements in medical journal citations, [3] between chapter and verse in Bible citations, [4] and, in the US, for salutations in business letters and other ...
2. Double factorial: if n is a positive integer, n!! is the product of all positive integers up to n with the same parity as n, and is read as "the double factorial of n". 3. Subfactorial: if n is a positive integer, !n is the number of derangements of a set of n elements, and is read as "the subfactorial of n". *
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Colon (punctuation), the punctuation mark (:) Two dots (diacritic), a mark used with a base letter to indicate that its pronunciation is somehow modified ( ̈ ̤) Diaeresis (diacritic), the diacritic mark used to denote the separation of two consecutive vowels; Umlaut (diacritic), the diacritic mark to indicate the vowel-fronting sound change